class_docstr: Exchange calendar for the London Stock Exchange
  
  Open Time: 8:00 AM, GMT
  Close Time: 4:30 PM, GMT
  
  Regularly-Observed Holidays:
  - New Years Day (observed on first business day on/after)
  - Good Friday
  - Easter Monday
  - Early May Bank Holiday (first Monday in May)
  - Spring Bank Holiday (last Monday in May)
  - Summer Bank Holiday (last Monday in May)
  - Christmas Day
  - Dec. 27th (if Christmas is on a weekend)
  - Boxing Day
  - Dec. 28th (if Boxing Day is on a weekend)
code: def open_time(self):
      return time(8, 1)
  
file_path: catalyst/catalyst/utils/calendars/exchange_calendar_lse.py
imports: from datetime import time
  from pandas.tseries.holiday import Holiday, DateOffset, MO, weekend_to_monday, GoodFriday, EasterMonday
  from pytz import timezone
  from .trading_calendar import TradingCalendar, MONDAY, TUESDAY, HolidayCalendar
label_desc: Use image node_id 3 for calling the LSEExchangeCalendar obj's underlying member method code with example usage: obj.open_time() and returns: time